blocks|key|330423|text|我能想到的两种方法。不过，局部视图并不能很好地在应用程序之间传输，因为您正在移动ascx文件。不是很痛苦，但不是我的口味。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|330424|我更喜欢使用WebControls。它们在mvc中非常简单，您所需要做的就是引用项目中的库，也可能是在您的配置文件中，然后就可以了。|offset|length|style|BOLD|330425|entityMap^0|0|6|B|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Two ways that I can think of. A partial view though this doesn't really transfer well from app to app because you are moving around ascx files. Not a big pain but not my flavour.

I prefer to use WebControls. They are super easy in mvc and all you need to do is reference the library in the project and possibly in your config file and there you go.

blocks|key|330565|text|总的来说，我同意用户控件在封装UI方面很好，但我不认为MVC中有太多真正的变化。如果我没记错的话，在传统的Asp.net项目中重用用户控件是一件痛苦的事情，而且从来都不是真正创建可重用组件的最佳方式。你为经典的ASP.net购买的大多数UI工具包都没有给你提供用户控件，它们本质上给你提供了服务器控件和javascript控件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|330566|在您的示例中，我可能会创建或找到一个jquery+(或您选择的框架)插件，它可以在客户端执行您想要的操作。您还可以围绕它构建一个C#包装器，类似于Telerik对一些jquery+UI控件所做的操作。我确实认为，随着您更深入地了解，甚至视图状态这个词都会从您的词汇表中消失。|offset|length|style|BOLD|330567|如果你看看MVC有哪些开源项目，你就会得到关于你应该做什么的答案。|330568|330569|+MVC+Contrib应用程序通过创建扩展方法和帮助器添加了许多功能。他们的网格控件是一种典型的创建可重用组件的方法，您可以跨projects|unordered-list-item|330570|Telerik，创建一些扩展来包装jquery控件和做资产management.|330571|Finally我认为如果您展望未来，MVC有areas，如果我理解正确，它将使您能够将项目拆分为多个较小的项目。|330572|330573|entityMap|0|LINK|mutability|MUTABLE|url|http://www.codeplex.com/MVCContrib|1|http://www.telerik.com/products/aspnet-mvc.aspx|2|http://aspnet.codeplex.com/Wiki/View.aspx?title=Road%2520Map^0|0|37|1|3A|4|0|0|0|1|B|0|0|0|7|1|0|M|5|2|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|15|8|@$D|16|E|17|F|G]|$D|18|E|19|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|1A|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|1C|8|@]|9|@$D|1D|E|1E|1|1F]]|A|$]]|$1|N|3|O|5|M|7|1G|8|@]|9|@$D|1H|E|1I|1|1J]]|A|$]]|$1|P|3|Q|5|M|7|1K|8|@]|9|@$D|1L|E|1M|1|1N]]|A|$]]|$1|R|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]|10|$5|V|W|X|A|$Y|11]]|12|$5|V|W|X|A|$Y|13]]]]

In general I would agree that user controls are nice in terms of encapsulating UI stuff, but I don't think too much has really changed in MVC. If I remember right re-using user controls across classic Asp.net projects was a pain and was never really the best way to truly create reusable components. Most UI toolkits that you bought for classic ASP.net didn't give you user controls, they gave you essentially server controls and javascript controls. 

In your example, I would probably create or find a jquery (or ur framework of choice) plugin that did what you wanted on the client side. You could also build a C# wrapper around it similar to what Telerik did with some of the jquery UI controls. I do think that the word code-behind and even viewstate will disappear from your vocabulary the more you get into MVC. 

If you look at what open source projects are out there for MVC you will get your answer in terms of what you should be doing.

<ul>
<li>The <a href="http://www.codeplex.com/MVCContrib" rel="noreferrer">MVC Contrib</a> app adds a lot of features by creating extension methods and helpers. Their grid control is a typical way to create a reusable component that you could use across projects</li>
<li><a href="http://www.telerik.com/products/aspnet-mvc.aspx" rel="noreferrer">Telerik</a>, created some extensions that wrap jquery controls and do asset management.</li>
<li>Finally I think if you look to the future, MVC has <a href="http://aspnet.codeplex.com/Wiki/View.aspx?title=Road%20Map" rel="noreferrer">areas</a>, which if I interpret it right will give you the ability to break your project apart into multiple smaller projects.</li>
</ul>

blocks|key|332714|text|除了已经提出的建议之外，ASP.NET+MVC+v2还将拥有通用的模板化输入控件，参见here。您可以阅读其他人如何使用类似的技术，例如，here|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|332715|332716|我们恰好有一个方法调用来生成表单元素“Html.InputFor”。作为“InputFor”的一部分，它检查一个输入规范，该规范收集PropertyInfo、任何属性、类型、调用的任何修饰符，并选择适当的InputBuilder。调用InputFor(p+=>+p.Id)，Id是GUID吗？这将创建一个隐藏的输入元素。调用InputFor(p+=>+p.Customer.Address)，地址是复杂类型吗？，它查找与类型|blockquote|332717|
同名的分部|332718|entityMap|0|LINK|mutability|MUTABLE|url|http://weblogs.asp.net/scottgu/archive/2009/07/31/asp-net-mvc-v2-preview-1-released.aspx|1|http://www.lostechies.com/blogs/jimmy_bogard/archive/2009/04/24/how-we-do-mvc.aspx^0|17|4|0|1X|4|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]|$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|-4|5|6|7|10|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|11|8|@]|9|@]|C|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@]|C|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]|R|$5|M|N|O|C|$P|S]]]]

Besides what is already suggested, ASP.NET MVC v2 will have generic templated input controls, see <a href="http://weblogs.asp.net/scottgu/archive/2009/07/31/asp-net-mvc-v2-preview-1-released.aspx" rel="nofollow noreferrer">here</a>. You can read how other people do similar techniques, for example, <a href="http://www.lostechies.com/blogs/jimmy_bogard/archive/2009/04/24/how-we-do-mvc.aspx" rel="nofollow noreferrer">here</a>:

<blockquote>
 We have
 exactly 1 method call for generating a
 form element, “Html.InputFor”. As
 part of that “InputFor”, it examines
 an input specification, that collects
 the PropertyInfo, any attributes, the
 type, any modifiers called, and
 selects an appropriate InputBuilder. 
 Call InputFor(p => p.Id) and Id is a
 GUID? That creates a hidden input
 element. Call InputFor(p =>
 p.Customer.Address) and Address is a
 complex type? That looks for a
 partial with the same name of the type
</blockquote>

blocks|key|3301190|text|我认为一些答案遗漏了控件的回发功能。处理这种情况的一种方法是在呈现局部视图时通过ViewData传递任何通用信息。然后，它可以回发到它自己的控件，而后者又可以重定向到UrlReferrer。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3301191|它有点凌乱，使用UrlReferrer会带来安全风险。但这是解决问题的一种方法。|3301192|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I think some of the answers have missed out on the postback functionality of controls. One way you could handle that is to pass any generic information via ViewData when rendering your partial view. That could then post back to its own control, which in turn could redirect to the UrlReferrer.

Its a little messy and use of UrlReferrer poses a security risk. But it is one way around the problem

blocks|key|3088287|text|在考虑了别人的有用答案后，我将尝试回答我自己的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3088288|在我看来，在MVC中模拟UserControls的关键困难在于它们横切了MVC旨在分离的关注点。我的例子中的from/to+date选择器UserControl包含了模型、视图、控件和交互的元素。UserControls将所有这些捆绑在一起的能力正是它们不能很好地融入MVC的原因。|3088289|这意味着在MVC中创建一个psuedo-UserControl需要四个独立的部分：|3088290|3088291|模型类-在本例中为Interval类或类似的|unordered-list-item|3088292|知道如何将模型呈现为HTML的PartialView+|3088293|在PartialView的HTML|3088294|上进行交互层的jQuery脚本可以将postdata反序列化到模型类的实例中的ModelBinder。|3088295|3088296|ModelBinder很重要，因为它处理从用户返回的数据。如果没有它，每个想要在任何视图中显示to/from日期选择器的Controller都必须知道如何组合六个postdata字段-以及如何处理它们无效或某些字段丢失的情况。|3088297|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|Y|8|@]|9|@]|A|$]]|$1|J|3|K|5|I|7|Z|8|@]|9|@]|A|$]]|$1|L|3|M|5|I|7|10|8|@]|9|@]|A|$]]|$1|N|3|O|5|I|7|11|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|T|$]]

Having considered the helpful answers from others, I will have a go at answering my own question.

It seems to me that the key difficulty with emulating UserControls in MVC is that they crosscut the concerns that MVC aims to seperate. The from/to date selector UserControl in my example incorporates elements of Model, View, Control and interation. UserControls' ability to bundle all this together is exactly the reason that they don't fit well into MVC.

That means that to create a psuedo-UserControl in MVC requires four seperate pieces:

<ul>
<li>A Model class - in this case an Interval class or similar</li>
<li>A PartialView that knows how to render the Model to HTML</li>
<li>A jQuery script to layer interactivity on top of the PartialView's HTML</li>
<li>A ModelBinder that can deserialise postdata into an instance of the Model class.</li>
</ul>

The ModelBinder is important because it deals with data coming back from the user. Without it, every Controller that wanted to display a to/from date selector in any of its Views would have to know how to assemble the six postdata fields - and how to cope if they were invalid or some were missing.

blocks|key|329464|text|您可以创建jQuery+plugin。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|329465|entityMap|0|LINK|mutability|MUTABLE|url|http://webcloud.se/article/Building_jQuery_plugins/^0|5|D|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You can create a <a href="http://webcloud.se/article/Building_jQuery_plugins/" rel="nofollow noreferrer">jQuery plugin</a>.

blocks|key|329469|text|作为ASP.NET+Webforms中提供的用户控件，提供了许多方法来使控件和代码可以在其他应用程序中重用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|329470|如果你的部分代码有一些C#逻辑，并且使用Razor/aspx代码来呈现，那么最好将它们保存在文件中。|offset|length|style|BOLD|329471|把JavaScript功能写成插件，如果你维护好你的代码，把它写得像在其他应用中一样好，那么这对你来说将是一个巨大的优势。下次使用其他应用程序时，只需打开此解决方案，复制并修改即可。编写可以用作插件的JavaScript代码可能需要更多的集思广益。|329472|编写代码作为单独的C#库如果某些代码对于你make.for的每个应用程序来说太常见了，你可以编写一个成员身份验证系统或一些全局函数(C#)，它们在你创建的每个应用程序中使用，然后在一个单独的解决方案中维护它们，这样当你将来尝试创建一个新的应用程序时，它就可以在你创建的其他应用程序中使用。|329473|entityMap^0|0|Z|B|0|0|H|0|0|C|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@$D|S|E|T|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@$D|V|E|W|F|G]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|M|$]]

As user-controls provided in ASP.NET Webforms, MVC provide a lot of ways to make the controls and code that can be reused in other app.

Using Partials If your partial code have some C# logic and render the html using Razor/aspx code then it's bst to maintain them in razor file.

Write JavaScript Functionality as plugin If you maintain your code and write it as better as it can be used in other app then it would be a huge advantage for you. Next time when you work on other app just open this solution copy it and modify it. Write JavaScript code that can be used as plugin maybe take some more brainstorming. 

Write Code As a Separate C# library If some code is too common for every app you make.for example you write a member authentication system or some global function (C#) that are used in every app you made then maintain them in a separate solution so it can be used in other app you made whenever you trying to make a new app in future.

In traditional ASP.NET Web Form applications, UserControls are a great way to encapsulate functionality so that it can be reused. However, UserControls don't fit well into the MVC model. They often make heavy use of ViewState and they blur the seperation of concerns that MVC promotes.

My question is, how do you best bundle a piece of functionality so it can be shared across MVC applications?

As an example, consider a from/to date-selector UserControl that:

<ul>
<li>allows a user to select two dates, either using a javascript overlay or by typing in day, month and year into seperate fields</li>
<li>can be configured to default to either today and tomorrow's dates or to dates of the developer's choosing</li>
<li>validates the dates that comes back from the user to ensure the from date is before the to date</li>
<li>exposes From and To properties that can be accessed by code-behind</li>
</ul>

How would I best build something like this in .NET MVC so that I can easily reuse it?

Note that to fully emulate User Control's functionality the MVC component would have to manage the submitted form data and validation - not just the presentation.

What is the unit of reusability in .NET MVC apps?

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在传统的ASP.NET Web表单应用程序中，UserControls是封装功能以便重用的好方法。然而，UserControls并不能很好地适应MVC模型。他们经常大量使用ViewState，他们模糊了MVC所提倡的关注点的分离。我的问题是，如何最好地捆绑一段功能，以便它可以在MVC应用程序之间共享？例如，考虑一个fr...

问.NET MVC应用程序中的可重用性单位是什么？
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